A self-reactivated PdCu catalyst for aldehyde electro-oxidation with anodic hydrogen production.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39543188.
- Also identified by DOI 10.1038/s41467-024-54286-y and PMC identifier 11564531.
- Licence recorded as CC BY-NC-ND.
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Abstract
The low-potential aldehyde oxidation reaction can occur at low potential (~0 V<sub>RHE</sub>) and release H<sub>2</sub> at the anode, enabling hydrogen production with less than one-tenth of the energy consumption required for water splitting. Nevertheless, the activity and stability of Cu catalysts remain inadequate due to the oxidative deactivation of Cu-based materials. Herein, we elucidate the deactivation and reactivation cycle of Cu electrocatalyst and develop a self-reactivating PdCu catalyst that exhibits significantly enhanced stability. Initially, in-situ Raman spectroscopy confirm the cycle involved in electrochemical oxidation and non-electrochemical reduction. Subsequently, in-situ Raman spectroscopy and X-ray absorption fine structure reveal that the Pd component accelerates the rate of the non-electrochemical reduction, thereby enhancing the stability of the Cu-based electrocatalyst. Finally, a bipolar hydrogen production device is assembled utilizing the PdCu electrocatalyst, which can deliver a current of 400 mA cm<sup>-2</sup> at 0.42 V and operate continuously for 120 h. This work offers guidance to enhance the stability of the Cu-based electrocatalyst in a bipolar hydrogen production system.